JP4679404B2 - Work vehicle - Google Patents

Description

  The present invention relates to a work vehicle in which a front loader can be attached to a front portion of a vehicle body.

A front loader can be mounted on the front of the vehicle body, a pair of left and right rear wheel fenders are provided to cover the inside of the pair of left and right rear wheels, and a work vehicle has a driver seat between the pair of left and right rear wheel fenders. For example, there is a work vehicle called TLB in which a front loader is attached to the front part of the tractor and a backhoe is attached to the rear part. This type of conventional work vehicle has a front loader side, for example, a front loader support frame (loader mounting). There is a member provided with a loader control valve for controlling the front loader and a control lever for operating the loader control valve (for example, Patent Document 1 and Patent Document 2).
JP 2003-278179 A JP 2000-309940 A

Therefore, in the conventional case, the loader control valve and the loader control lever provided on the front loader side are considerably far from the driver seat between the rear wheel fenders, so that the driver has difficulty in operating the control lever from the driver seat. It was.
Therefore, it is considered to place the control lever on the side of the driver's seat away from the loader control valve provided on the front loader side, and connect the control lever and loader control valve with a push-pull cable. When the pull cable is used, water may enter the push-pull cable and freeze in cold regions. In this case, it becomes difficult to operate the loader control valve with the control lever.

  The present invention has been made in view of the above-mentioned problems, and can easily and smoothly operate a loader control valve by a control lever even in a cold region.

Features of the present invention for solving this technical problem will be described below.
First, in a work vehicle in which a front loader can be attached to the front portion of the vehicle body, and a driver's seat is provided above a transmission case between a pair of left and right rear wheel fenders that covers the inside of a pair of left and right rear wheels,
A mounting plate projecting upward from the left and right sides of the transmission case of the vehicle body on the inner side in the left-right direction of the pair of rear wheel fenders, and a loader control valve for the front loader attached to the mounting plate, A control lever for the front loader supported swingably at the upper end of the mounting plate,
The loader control valve has a first spool and a second spool that are slidable in the vertical direction along the mounting plate and are arranged side by side in the front-rear direction.
A link that connects the first spool and the control lever and another link that connects the second spool and the control lever are arranged side by side on the side of the mounting plate where the loader control valve is mounted. It is characterized by that.
Secondly, on the side of the mounting plate on which the loader control valve is mounted, a lock pin that can be moved back and forth with respect to the link to lock and unlock the swing of the control lever, and a lock pin of the lock pin. Provide a lock lever to operate the insertion and removal of the link,
The lock lever is arranged below the control lever.
Third, the mounting plate protrudes upward toward the left and right sides of the driver seat,
The loader control valve is attached to an outer side surface in the left-right direction of the attachment plate.
Fourth, the control lever is disposed between the mounting plate and the driver's seat and the left and right rear fenders in the left-right direction.
Further, the technical means of the present invention is such that a front loader can be attached to the front part of the vehicle body, a pair of left and right rear wheel fenders are provided to cover the inside of the pair of left and right rear wheels, and between the pair of left and right rear wheel fenders. In a work vehicle with a driver's seat,
A loader control valve for controlling the front loader is provided on the inner side in the left-right direction of the pair of rear wheel fenders, a control lever is provided on the side of the driver's seat, and the spool portion side of the loader control valve is on the rear side of the one. The control lever is disposed inward in the left-right direction of the wheel fender and is connected to the spool portion of the loader control valve by a link.

According to another technical means of the present invention, the loader control valve has a spool portion disposed on the upper side, a control lever is disposed above the loader control valve so as to protrude upward, and a lower side of the control lever swings. It is freely supported and connected to the spool portion of the loader control valve via a link.
In another technical means of the present invention, the control lever is supported so as to be swingable in the front-rear direction and the left-right direction, the loader control valve has a first spool portion and a second spool portion, and a lower portion of the control lever. The side is connected to the first spool part via a link so that the first spool part can be operated by swinging the control lever left and right, and the second spool part can be operated by swinging the control lever back and forth. As described above, the second spool portion is connected to the second spool portion via another link.

  Another technical means of the present invention is that the mounting plate protrudes upward from the vehicle body side to the side of the driver's seat, the loader control valve is mounted on the outer side in the left-right direction of the mounting plate, and the upper end portion of the mounting plate The control lever is swingably supported, and the link and the spool portion side of the loader control valve are located outside the driver's seat and between the mounting plate and one of the rear wheel fenders. is there.

  According to the present invention, the control lever provided on the side of the driver's seat that is easy to operate from the driver's seat is used to connect the loader control valve with the link without using a push-pull cable or the like. The loader control valve can be easily and smoothly operated by the control rail lever even in cold regions.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2, reference numeral 1 denotes a work vehicle referred to as a TLB. The work vehicle 1 is configured such that a front loader 3 can be attached to a front portion of a tractor 2 and a backhoe 4 can be attached to a rear portion thereof.
The vehicle body 2A of the tractor 2 includes a front engine, a clutch housing 9 connected to the rear part of the engine via a flywheel housing and the like, a transmission case 10 connected to the rear of the clutch housing 9, and the like. It is supported by a pair of left and right front and rear wheels 7 and 8 so as to be able to run.

A front axle frame 11 extending forward from the engine is attached and fixed to the lower left and right side surfaces of the engine with bolts, and a battery, a radiator, a fuel tank, and the like are supported on the front axle frame 11, and the engine, battery, and radiator are supported. The fuel tank is covered with a bonnet 12.
A rear wheel fender 13 that covers the inside of the rear wheel 8 is provided on both the left and right sides of the rear part of the vehicle body 2A, and a driver's seat 14 is provided between the left and right rear wheel fenders 13. A steering handle 15 is provided in front of the driver seat 14. As shown in FIG. 3, a floor seat 19 is provided between the front lower ends of the pair of rear wheel fenders 13 so as to protrude forward, and the floor seat 19 is disposed below the steering handle 15 and the driver seat 14. . A standing wall 19 </ b> A is provided at the rear end portion of the floor seat 19 so as to protrude upward, and the standing wall 19 </ b> A is disposed between the pair of rear wheel fenders 13.

Work machine mounting frames 16 for mounting the front loader 3 and the backhoe 4 to the tractor 2 are disposed on the left and right sides of the vehicle body 2A. The left and right work machine mounting frames 16 are connected to each other, and the front portion is The lower part of the engine or the rear part of the front axle frame 11 is fixed, and the rear part is fixed to the rear axle case 17 of the rear part of the transmission case 10.
In addition, a loader mounting member 18 is fixed to the front portion of each of the left and right work implement mounting frames 16 so as to protrude upward.
The front loader 3 is detachably attached to the left and right loader attachment members 18. The front loader 3 is pivotally connected to the upper portion of the loader mounting member 18 so as to be pivotable about a left-right axis, and is rotatable about a left-right axis on the front end side of the left-right boom 20. And a pivotally connected bucket 21.

The boom 20 is vertically swung by the expansion and contraction of the boom cylinder 22 interposed between the loader mounting member 18 and the boom 20, and the bucket 21 is connected to the bucket cylinder 23 interposed between the boom 20 and the bucket 21. Squeeze dump operation by expansion and contraction.
The backhoe 4 includes a base 24 that is detachably attached to the rear portions of the left and right work implement mounting frames 16, a swing bracket 25 that is supported on the rear portion of the base 24 so as to swing left and right about a vertical axis, and the swing. A boom 26 pivotally connected to the lower side of the bracket 25 so as to be rotatable about a left-right axis, and an arm pivotally connected to the tip side of the boom 26 so as to be rotatable about a left-right axis. 27, a bucket 28 pivotally connected to the distal end side of the arm 27, and outriggers (not shown) provided on both left and right sides of the base 24.

  The swing bracket 25 is swung left and right by expansion and contraction of a pair of left and right swing cylinders 30 interposed between the base 24 and the swing bracket 25, and the boom 26 is interposed between the swing bracket 25 and the boom 26. The boom 27 is swung up and down by the expansion and contraction of the boom cylinder 31, and the arm 27 is swung up and down by the expansion and contraction of the arm cylinder 32 interposed between the boom 26 and the arm 27. The left and right outriggers are moved by a pair of left and right outrigger cylinders 29 shown in FIG. 6 interposed between the outrigger and the base 24, respectively. It is swung up and down.

At the rear part of the vehicle body 2A, a three-point link 36 consisting of one top link (not shown) arranged at the center in the left-right direction and a pair of lower left and right lower links 35 can be mounted. In a state in which the rear working machine is removed, a rear work machine such as a box scraper (leveling work machine), a rotary tiller, or the like can be mounted on the rear part of the vehicle body 2A via the three-point link 36 so as to be movable up and down.
At the rear of the vehicle body 2A, there is provided a hydraulic lifting device 39 that swings the lower link 35 of the three-point link 36 up and down to raise and lower the rear working machine. A cylinder 40 and a position control valve (cylinder control valve) 41 shown in FIG. 6 are provided. The position control valve 41 controls the hydraulic cylinder 40 and is attached to a housing of the hydraulic cylinder 40 or the like.

The hydraulic cylinder 40 is constituted by a single-acting cylinder in which one end side of the cylinder chamber is open, and the housing is fixedly attached to the upper surface of the rear portion of the transmission case 10 on the lower surface side. 48.
The front end side (rear part) of each lift arm 48 is connected to the lower link 35 on the same side in the left-right direction via a lift rod 49, and when the lift arm 48 swings upward, the left and right lift rods 49 are pulled up. The left and right lower link 35 swings upward, and the rear work machine attached to the three-point link 36 is thereby raised.

  As shown in FIG. 6, the work vehicle 1 includes a loader control valve 37 that controls the front loader 3, a backhoe control valve 38 that controls the backhoe 4, and a position control valve 41 that controls the hydraulic cylinder 40. The control valve 37 includes a boom control valve 51 that controls the boom cylinder 22 of the front loader 3, a bucket control valve 52 that controls the bucket cylinder 23, and the like. The backhoe control valve 38 controls the swing control valve 55 that controls the swing cylinder 30 of the backhoe 4, the boom control valve 56 that controls the boom cylinder 31, the arm control valve 57 that controls the arm cylinder 32, and the bucket cylinder 33. A bucket control valve 58 and an outrigger cylinder 29 for controlling the outrigger cylinder 29 are provided. The position control valve 41 has a main switching valve 61 and a shutoff valve 62.

The tractor 2 has a hydraulic pressure such as a main pump P1 that supplies hydraulic oil to the loader control valve 37, the backhoe control valve 38, and the position control valve 41, an auxiliary pump P2 that supplies hydraulic oil to the power steering device 63, the HST 64, and the like. A pump is provided, and these hydraulic pumps P1 and P2 are provided, for example, on the front side of the clutch housing 42, and are driven by rotational power from the engine.
The loader control valve 37 is provided with a main relief valve 66, and the main relief valve 66 common to the hydraulic lifting device 39, the backhoe 4 and the front loader 3 is integrated with the loader control valve 37. Further, as will be described later, a loader control valve 37 is provided not on the front loader 3 side but on the tractor 2 side.

  In this way, the main relief valve 66 can be integrated with the loader control valve 37 to reduce the cost. That is, conventionally, a main relief valve 66 is provided separately from the loader control valve 37, the loader control valve 37 is attached to the front loader 3, and the main relief valve 66 is independently provided between the main pump P1 and the front loader 3. Since it is provided, a hydraulic block for the main relief valve 66 is required, which increases costs and is disadvantageous in terms of space. Conventionally, since the loader control valve 37 is attached to the front loader 3 side, if the main relief valve 66 is attached to the loader control valve 37, the tractor 2 alone cannot inspect the hydraulic lifting device 39 or the like. However, by attaching the loader control valve 37 to the tractor 2 as described above, even if the main relief valve 66 is integrated with the loader control valve 37, the hydraulic lifting device 39 can be inspected and the like. By integrating the loader control valve 37 with the loader, the cost can be reduced.

1 to 5, a loader control valve 37 is provided on the inner side in the left-right direction of the pair of rear wheel fenders 13, and a control lever 70 is provided on the right side of the driver's seat 14. A mounting plate 69 protrudes upward from the transmission case 10 on the vehicle body 2A side toward the right side of the driver's seat 14, a loader control valve 37 is mounted on the outer surface of the mounting plate 69, and a control is provided at the upper end of the mounting plate 69. The lever 70 is swingably supported.
The loader control valve 37 has a first spool portion 71 and a second spool portion 72, and the spool portions 71 and 72 are arranged on the upper side. A control lever 70 is disposed above the loader control valve 37 so as to protrude upward, and a lower side of the control lever 70 is swingably supported by a mounting plate 69. The control lever 70 is swingable in the front-rear direction and the left-right direction. The lower side of the control lever 70 is connected to the first spool portion 71 via a direct acting link 73 and is connected to the second spool portion 72 via another direct acting link 74, The first spool portion 71 can be operated by swinging the control lever 70 left and right, and the second spool portion 72 can be operated by swinging the control lever 70 back and forth.

The spool portions 71 and 72 side of the loader control valve 37 is disposed inward in the left-right direction of one (right side) rear fender 13, and the links 73 and 74 and the spool portions 71 and 72 side of the loader control valve 37 are operated. It is located outside the seat 14 and between the mounting plate 69 and one (right side) rear wheel fender 13.
When the control lever 70 is swung forward from the neutral position, the link 73 moves downward and the first spool portion 71 is pressed downward. As a result, for example, the boom 20 is retracted by the reduction operation of the boom cylinder 22. If the control lever 70 is swung downward from the neutral position by swinging downward, the link 73 moves upward and the first spool 71 is pulled upward, whereby, for example, the boom cylinder 22 is extended. As a result, the boom 26 swings upward. If the control lever 70 is swung from the neutral position to the left side, the link 74 moves downward, and the second spool portion 72 is pressed downward. As a result, the bucket 28 is dumped by the extension operation of the bucket cylinder 33, for example. When the control lever 70 is operated to swing rightward from the neutral position, the link 74 moves upward, and the second spool portion 72 is pulled upward. 28 is designed to scoop.

  A lock lever 77 is provided below the control lever 70. The lock lever 77 is movably supported along the U-shaped guide groove 81 of the guide member 80 via the support 79 on the mounting base 85 of the mounting plate 69, and the tension spring via the support 79. 82 is biased downward. Further, the lock pin 84 is supported by the mounting base 85 so as to be movable back and forth, and the lock pin 84 is connected to the lock lever 77 via the support 79 so that the lock pin 84 moves back and forth in conjunction with the lock lever 77. Yes. Thus, when the lock lever 77 is moved along the guide groove 81 toward the links 73 and 74 (front side), the lock pin 84 is inserted in the links 73 and 74 in the front-rear direction, and the links 73 and 74 are inserted. Accordingly, the control lever 77 is locked so as not to swing in the front-rear direction and the left-right direction. The lock lever 77 is positioned along the guide groove 81 on the side opposite to the links 73 and 74 (rear side). ), The lock pin 84 is removed from the links 73 and 74 rearward so that the links 73 and 74 can be moved up and down, whereby the lock of the control lever 77 can be released. Yes.

  According to the embodiment, the loader control valve 37 for controlling the front loader 3 is provided on the inner side in the left-right direction of the pair of rear wheel fenders 13, and the control lever 70 is provided on the right side of the driver seat 14. The spool portions 71, 72 of the loader control valve 37 are disposed inward in the left-right direction of the right rear fender 13, and the control lever 70 is connected to the spool portion 71 of the loader control valve 37 by direct acting links 73, 74. , 72 are connected, and the loader control valve 37 is operated by the direct acting links 73, 74 using a control lever 70 provided on the side of the driver's seat 14 without using a push-pull cable or the like. The loader control valve 37 is controlled by the control rail lever 70 even in cold regions. It can be made easily and smoothly create. Moreover, since the spool portions 71 and 72 side of the loader control valve 37 are disposed inward in the left-right direction of the right rear wheel fender 13, the spool portions 71 and 72 side of the loader control valve 37 are placed on the right rear wheel fender 13. Thus, it is possible to effectively protect the soil and dust that are splashed by the rear wheels 8 and the like from being applied.

A mounting plate 69 projects upward from the vehicle body 2 </ b> A toward the side of the driver seat 14, and the links 73, 74 and the spool portions 71, 72 side of the loader control valve 37 are on the outer side of the driver seat 14. Since it is disposed between the mounting plate 69 and the right rear wheel fender 13, the links 73 and 74 and the spool portions 71 and 72 of the loader control valve 37 are connected by the mounting plate 69 and the right rear wheel fender 13. By sandwiching the side to the left and right, it is possible to more effectively protect the soil and dust that are splashed up by the rear wheels 8 and the like from being applied.
In the embodiment, the control lever 70 is provided on the right side of the driver's seat 14, the spool portions 71 and 72 side of the loader control valve 37 are disposed inward in the left-right direction of the right rear fender 13, and the link 73 , 74 and the spool portions 71, 72 side of the loader control valve 37 are arranged on the outer side of the driver's seat 14 and between the mounting plate 69 and the right rear wheel fender 13, but instead, The control lever 70 may be provided on the left side of the driver's seat 14, and in this case, the spool portions 71, 72 side of the loader control valve 37 may be disposed inward in the left-right direction of the left rear fender 13. . Further, the mounting plate 69 is provided on the left side of the driver's seat 14, and the links 73 and 74 and the spool portions 71 and 72 side of the loader control valve 37 are arranged on the left outer side of the driver's seat 14 on the left side of the driver's seat 14. It may be arranged between the rear wheel fender 13.

It is a side view of the work vehicle which shows one Embodiment of this invention. It is a rear view of the work vehicle. It is a side view of the rear-wheel fender and a mission case part. It is a front view of the control lever and a loader control valve part. It is a side view of the loader control valve and a link part. It is the hydraulic circuit diagram.

Explanation of symbols

2A Car body 3 Front loader 8 Rear wheel 13 Rear wheel fender 14 Driver's seat 37 Loader control lever 71 First spool portion 72 Second spool portion 73 Link 74 Link

Claims (4)

The front loader (3) can be mounted on the front part of the vehicle body (2A), and the vehicle is driven above the transmission case (10) between the pair of left and right rear wheel fenders (13 ) covering the inside of the pair of left and right rear wheels (8). In a work vehicle provided with a seat (14),
In the left-right direction inner side of the pair of rear wheel fenders (13), the upper projecting from the mounting plate from one of the left and right sides of the transmission case (10) of the body (2A) and (69), the mounting plate ( 69) and a loader control valve (37) for the front loader (3) attached to the front loader (3), and a control lever for the front loader (3) supported swingably on the upper end of the attachment plate (69). 70), and
The loader control valve (37) has a first spool (71) and a second spool (72) which are slidable in the vertical direction along the mounting plate (69) and arranged in the front-rear direction.
A link (73) for connecting the first spool (71) and the control lever (70), and another link (74) for connecting the second spool (72) and the control lever (70), A work vehicle characterized by being arranged side by side on the side of the mounting plate (69) where the loader control valve (37) is mounted . On the side of the mounting plate (69) where the loader control valve (37) is mounted, the control lever (70) is moved back and forth with respect to the links (73, 74) in order to lock and unlock the swing. A detachable lock pin (84) and a lock lever (77) for operating insertion / removal of the lock pin (84) with respect to the links (73, 74) are provided,
The work vehicle according to claim 1, wherein the lock lever (77) is arranged below the control lever (70) . The mounting plate (69) protrudes upward toward the left and right sides of the driver seat (14),
The work vehicle according to claim 1 or 2 , wherein the loader control valve (37) is attached to a laterally outer side surface of the attachment plate (69) . Claim 1, characterized in that said are disposed control lever (70) between the mounting plate in the horizontal direction and (69) and the driver's seat (14) and one lateral side of the rear wheel fenders (13) to 4. The work vehicle according to any one of items 3 .

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